[*] Items: Fix custom items when using multi-environment titles.
[*] Items: When embedding items into maps, discard the icon to save space.
[*] Items: Items edited in the mesheditor are now much smaller (disk size).
[*] Items: The icon is now included into the file when using the item editor.
[*] MeshEditor: improvements and the beginnings of a custom material editor.

definitely, keep it up

edit: Just a suggestion but I'd like to see animated textures in materials for meshes and also Adverts in items
(and also, signs above start/finish/checkpoint/multilap in stadium have broken UVs when converting to item, i'd like that fixed)

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